If you're an aficionado of Twitter or the short-form blogging platform, Tumblr, over the last couple of weeks, you've no doubt become aware of the make-your-own-mix tape service, Muxtape. A seemingly home-spun operation with no obvious profit motive, Muxtape allows anyone to upload a series of songs to its servers to create, and then distribute online, a digital "mix tape" along the lines of the ones you made for your unrequited paramours back in college. (News.com, A VC)